CN115165242A - Centrifugal test device and method for simulating buried pipeline reciprocating leakage induced ground subsidence - Google Patents
Centrifugal test device and method for simulating buried pipeline reciprocating leakage induced ground subsidence Download PDFInfo
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- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
- G01M3/18—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/182—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for tubes
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Abstract
The invention discloses a centrifugal test device and method for simulating ground subsidence induced by reciprocating leakage of a buried pipeline, and belongs to the field of civil engineering. The main structure comprises a box body with a transparent window at the front side, and the inside of the box body comprises a bin partition plate, a damaged pipeline model, an external water level control permeable plate, a water-sand separation device and the like. The front part of the device is divided into a test soil bin for filling a model soil body and seepage bins on two sides; the rear part of the device is divided into a soil material filtering bin and water circulation supply bins at two sides. The front end of the damaged pipeline model is provided with a motor push rod for controlling the opening and closing of the damaged notch of the pipeline, and the rear part of the damaged pipeline model is provided with a ball valve device and is connected with a water pump. The invention utilizes the scale reduction and time reduction effects of the geotechnical centrifugal model test in the Ng hypergravity field, realizes the reciprocating leakage hydraulic condition of water seepage inside and outside the pipe by adopting the ball valve device, controls the size of a damaged gap by utilizing the motor push rod, and can reproduce the evolution process of ground collapse induced by the damage of the buried pipeline under the real stress level.
Description
Technical Field
The invention belongs to the field of civil engineering, and particularly relates to a centrifugal test device and method for simulating underground pipeline reciprocating leakage to induce ground subsidence.
Background
With the increasing urbanization rate of China, buried pipelines such as rain and sewage pipelines, communication pipelines and the like are important infrastructure for ensuring urban functions. Buried pipelines are easily damaged at pipe walls, pipeline joints and the like due to reasons of over-service, manufacturing defects, construction disturbance and the like. In areas with abundant hydraulic conditions, such as high underground water level areas and areas with large rainfall in rainy seasons, the foundation soil body is lost through damaged pipelines due to the internal seepage of water flow outside the pipes. When the precipitation is large, the full pipe flow in the pipe leads to water flow extravasation to aggravate soil body degradation. Along with the reciprocating seepage action of the exosmosis and the endossmosis, seepage erosion in foundation soil is continuously developed, the mechanical property of a soil body is degraded, and serious consequences such as unstable collapse of a foundation and the like can occur under the action of external load. The disasters have the characteristics of concealment, outburst and the like, are more frequent in urban areas, and particularly are areas with concentrated population and industrial areas with developed underground pipe networks. Once such disasters happen, not only can great life and property loss be caused, but also great social public opinion can be caused. Ground collapse disasters caused by buried pipeline damage are high in concealment and serious in consequence, and along with long-term service of the pipeline, the damage rate of the pipeline is improved, and the disaster occurrence risk is increased day by day. The process of ground collapse disaster induced by buried pipeline damage is greatly different from the traditional foundation instability mechanism and closely related to soil seepage erosion, and the current research on the damage mechanism is insufficient and lacks of an effective prevention and control means.
In the field of scientific research, physical simulation tests are important means for finding objective properties of things and revealing development rules of things. The related purposes of scaling, shrinking and restoring the real stress state can be achieved by utilizing the supergravity technology. Therefore, the centrifugal machine is used for providing supergravity, the research is carried out on the problems related to the ground subsidence caused by the damage of the underground pipeline under the reciprocating leakage, and the pore water pressure and the ground deformation evolution law in the ground subsidence process can be revealed. At present, no centrifugal model test device for simulating the damaged buried pipeline to induce the ground collapse under the reciprocating leakage by using a supergravity method is available.
Disclosure of Invention
The invention aims to provide a supergravity centrifugal model test device and a supergravity centrifugal model test method which can reproduce the ground collapse triggering and evolution process of a damaged buried pipeline under the reciprocating leakage condition under the action of a real stress level.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a centrifugal test device for simulating ground subsidence induced by reciprocating leakage of a buried pipeline, which comprises a model box body, a damaged pipeline model, a servo control system and a monitoring sensing system, wherein the model box body is divided into a front part and a rear part by a chamber partition plate, and the chamber partition plate is provided with a mounting hole for fixing the damaged pipeline model;
the front part in the model box body is provided with a test soil bin and seepage bins on two sides of the test soil bin, and the front end of a damaged pipeline model in the test soil bin is provided with a damaged notch with adjustable size; the rear part in the model box body is provided with a soil material filtering bin and water circulation supply bins on two sides of the soil material filtering bin, the rear end of a damaged pipeline model in the soil material filtering bin is provided with a water inlet and outlet control device, and a water sand separation device is arranged below the water inlet and outlet control device; the bin partition plate is provided with a water level limiting hole for communicating the seepage bin and the water circulation supply bin;
the servo control system is used for controlling the size of a damaged gap and the internal and external water levels of the damaged pipeline model; the monitoring and sensing system is used for measuring soil pressure, water pressure and soil surface displacement of the test soil bin in real time and measuring strain conditions of the water-sand separation device of the soil filtering bin.
Further, the damaged pipeline model comprises a pipeline main body, a pipeline front end sealing cover, a pipeline rear end sealing cover and an electric push rod assembly; the pipeline main body is fixed in a mounting hole of the cabin partition plate through a flange plate, the pipeline front end sealing cover and the pipeline rear end sealing cover are respectively used for sealing the front end and the rear end of the pipeline main body, and the damaged notch is positioned on the pipeline main body and close to the pipeline front end sealing cover; the electric push rod assembly is arranged on the inner side of the sealing cover at the front end of the pipeline, and the size of the damaged notch is adjusted through the rubber plug at the end part of the electric push rod assembly.
Furthermore, the water inlet and outlet control device adopts a ball valve device, and the ball valve device is installed on a sealing cover at the rear end of the pipeline and used for switching the water inlet and the water discharge of the damaged pipeline model.
Furthermore, the soil filtering bin and the water circulation supply bins at the two sides of the soil filtering bin are separated by a pair of baffles, and the bottoms of the baffles are provided with holes communicated with the soil filtering bin and the water circulation supply bins; the water-sand separation device is fixed in the soil material filtering bin through a baffle and is positioned below the damaged pipeline model.
Furthermore, the water-sand separation device is one or more layers of filter plates.
Furthermore, a submersible pump is installed in the water circulation supply bin, and the submersible pump is respectively connected with the water inlet and outlet control device of the damaged pipeline model and the seepage bin through a controllable water outlet pipeline.
Furthermore, the monitoring sensing system comprises a strain monitoring assembly, a pore pressure sensor, a soil pressure sensor, a laser displacement sensing device and a high-speed camera assembly;
the pore pressure sensor and the soil pressure sensor are buried in the soil body of the test soil bin in a line mode in a layered mode; the laser displacement sensing device is arranged above the test soil bin in a linear mode and used for measuring the soil surface displacement in the test soil bin; the strain monitoring assembly is arranged on the water-sand separation device and is used for measuring the strain condition of the water-sand separation device; the high-speed camera assembly is arranged at the visible window of the front plate of the box body.
Furthermore, the servo control system comprises a servo controller and a plurality of servo actuators, and each servo actuator is respectively used for realizing the adjustment of the circulating water quantity and the flow direction of the water circulating supply bin, the switching of the water inlet and the water outlet functions of the water inlet and outlet control device and the adjustment of the size of a damaged gap of the damaged pipeline model.
The invention has the beneficial effects that:
1. the water pump and the servo control system are formed by the submersible pump, the water pressure gauge and the servo control system, the water circulation supply bin, the water permeable plate and the ball valve device are combined to realize the water circulation use of the test device, and the water level heights inside and outside the pipe can be adjusted in real time respectively.
2. The invention originally provides a soil body reciprocating leakage simulation technology under the condition of hypergravity, reflects the real stress state and the real hydraulic condition of the damaged buried pipeline under different seasons and different regions according to the experience of the hypergravity test under the real condition, and realizes the reciprocating leakage technology of the geotechnical centrifugal buried pipeline model.
3. The invention originally provides a real-time monitoring technology for soil particle escape in a supergravity state, a soil material filtering bin for separating water and soil mixtures is arranged according to a mechanical principle, and a strain detection assembly is arranged on a filtering plate, so that a real-time detection curve reflecting the soil particle escape condition can be accurately obtained.
4. According to the invention, the high-speed camera is arranged to shoot the test process through the transparent window, and the quantitative analysis is carried out on the soil body state under the condition of pipeline damage by combining the image velocimetry (PIV), so that the deformation trend of the soil body in the test soil bin can be accurately reflected.
5. The invention realizes dynamic measurement of pore water pressure evolution inside foundation soil by embedding the pore pressure sensor so as to assist the work of the correction water circulation system. The laser displacement sensor is utilized to monitor the deformation of the surface of the foundation soil, and the soil pore pressure-displacement relation can be obtained through the joint analysis of the pore pressure sensor and the laser displacement sensor.
6. The invention can realize flexible simulation of damaged pipeline openings, the size and the direction of the damaged pipeline openings can be adjusted by changing the connection angle between the pipeline and the chamber partition plate, and the applicable test range is wide. All water circulation and soil particle migration occur inside the model box, no mass communication exists between the model box and the outside, large changes of physical parameters such as mass and centroid cannot be generated, the influence on the working state of the geotechnical centrifuge is small, and the stability and accuracy of the design are more advantageous.
In summary, the invention is based on a hypergravity model test, and provides hypergravity through a centrifugal device, so that the internal erosion and instability processes of foundation soil in a real stress state can be reduced under the condition of hydraulic condition change, and an analysis method and a test support are provided for revealing the problems related to the change trends of soil deformation, pore water pressure and the like in the problem of foundation collapse induced by damaged pipelines.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of the overall structure of a testing apparatus provided in an embodiment of the present invention;
FIG. 2 is a top view of a test device provided by an embodiment of the present invention;
FIG. 3 is a schematic rear view of a test apparatus provided in an embodiment of the present invention (with the back plate hidden);
FIG. 4 is a schematic view of a pipe simulating damage;
FIG. 5 is a schematic front view of a testing apparatus provided in an embodiment of the present invention (with the front panel of the case and the high-speed camera assembly hidden);
FIG. 6 is a schematic diagram of a laser displacement sensor apparatus according to an embodiment of the present invention;
FIG. 7 is a schematic view of a ball valve apparatus provided by an embodiment of the present invention;
FIG. 8 is a schematic view of a filter board and a strain detection assembly according to an embodiment of the invention;
FIG. 9 is a schematic diagram of the operation provided by an embodiment of the present invention;
in the figure: 1-model box body, 101-front box body plate, 1011-visible window, 102-left box body plate, 103-right box body plate, 104-back box body plate, 105-bottom box body plate and 106-fixed clamping plate; 2-damaged pipeline model, 201-pipeline main body, 202-damaged gap, 203-pipeline front end sealing cover, 204-pipeline rear end sealing cover, 205-ball valve device, 206-electric push rod assembly, 207-flange plate and 207-rubber plug; 301-strain monitoring component, 302-pore pressure sensor, 303-soil pressure sensor, 304-laser displacement sensing device, 3041-laser displacement sensor connecting rod, 3042-laser displacement sensor, 305-high speed camera component; 4-chamber divider plate, 401-water level limiting hole; 5-a water permeable plate; 6-a baffle plate; 7-a filter plate; 8-test soil bin; 9-seepage bin; 10-a soil material filtering bin; 11-a water circulation supply bin; 12-submersible pump.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The related purposes of reducing the scale, reducing time and restoring the real stress state can be achieved by utilizing the supergravity technology. According to the invention, the centrifugal machine is used for providing supergravity, the research on the problem related to ground subsidence caused by damage of the buried pipeline in a reciprocating leakage state is carried out, and the pore water pressure and the ground deformation evolution rule in the ground subsidence process can be revealed. At present, no centrifugal model test device for simulating the damaged buried pipeline to induce the ground to collapse under the reciprocating leakage state by using a supergravity method is available. The present embodiments are well suited to attain the ends and advantages mentioned above, as well as those that will become apparent to those skilled in the art upon examination of the following detailed description.
As shown in fig. 1 and 2, the centrifugal test device for simulating ground subsidence induced by reciprocating leakage of a buried pipeline provided by the embodiment comprises a model box body 1, a damaged pipeline model 2, a servo control system and a monitoring sensing system, wherein the model box body is divided into a front part and a rear part by a chamber partition plate 4, and the chamber partition plate 4 is provided with a mounting hole for fixing the damaged pipeline model.
In the embodiment, the model box body 1 comprises a box body front plate 101 with a visual window 1011, a box body back plate 104, a box body right side plate 103, a box body left side plate 102 and a box body bottom plate 105, the five parts form the model box body, the model box body is made of steel structures, the deformation and the strength of the model box body can be ensured to adapt to the Ng gravity acceleration and the requirements of a bearing test model, and the model box body can be arranged on a centrifuge basket; furthermore, a fixing clamp 106 is provided on the mold box body 1 for fixing the mold box body and the internal structure. The high-speed camera component 305 is installed outside the visible window 1011, a real-time shooting test process can be realized, and the structure of the high-speed camera component 305 consists of a lamp strip for light supplement, a high-speed camera for shooting and an installation kit.
The internal structure of the model box body consists of a bin partition plate 4, a pair of permeable plates 5 and a pair of baffles 6, and all the plates are connected by bolts so as to facilitate test adjustment. The bin partition plate 4 divides the inner part of the model box body into a front part and a rear part, and mounting holes for fixing the damaged pipeline model are formed in the bin partition plate 4; the front part in the model box body is divided into a test soil bin 8 and seepage bins 9 on two sides of the test soil bin by a pair of water permeable plates 5, the water permeable plates can eliminate the scouring effect of water flow on soil, the boundary effect that the water flow enters the test soil bin from the seepage bins is reduced, and the underground water internal seepage state can be well reflected under the real condition; the back part in the model box body is divided into a soil material filtering bin 10 and water circulation supply bins 11 at two sides of the soil material filtering bin by a pair of baffle plates 6, holes for communicating the soil material filtering bin 10 with the water circulation supply bins 11 are arranged at the bottoms of the baffle plates, and water level limiting holes 401 for communicating the seepage bin 9 with the water circulation supply bins 11 are arranged on the bin partition plate 4.
As shown in fig. 3, the submersible pumps 12 are installed in the water circulation supply bins at both sides, the submersible pumps 12 are respectively connected with the water inlet and outlet control device of the damaged pipeline model and the seepage bin 9 through controllable water outlet pipelines, and the water level of the seepage bin can be adjusted through the height of the water level limiting hole 401, so that the purpose of controlling the water level outside the pipeline is achieved. The height adjustment of the water level limiting hole can be realized by the prior art, for example, the openable and closable water level limiting holes with different heights can be arranged, and the water inlet and outlet control device can be realized by a ball valve device 205 which is arranged on the pipe rear end sealing cover 204 and is used for switching the water inlet and the water outlet of the damaged pipe model 2.
The soil material filter bin in be equipped with water sand separator for water and soil mixture that flows to the impaired pipeline of simulation carries out the stage filtration, its purpose is water sand separation, soil granule can be blocked by filter plate group and rivers can freely pass, make the soil granule that runs off satisfy the immersible pump and intake the requirement of quality of water by filter plate group hierarchical collection and the water after filtering, conveniently carry out the analysis to granule escape behavior, water sand separator can be fixed through predetermineeing the jack on the baffle of both sides.
As shown in fig. 4 (a) - (c), the damaged pipeline model is composed of a pipeline main body 201, a pipeline front end sealing cover 203, a pipeline rear end sealing cover 204 and an electric push rod assembly 206, wherein the pipeline main body 201 is connected with the chamber partition plate 4 through a flange 207 and a bolt, the front part of the pipeline main body is located in the test soil bin 8, and the rear part of the pipeline main body is located in the soil filtering bin 10; the pipeline main body 201 is provided with a damaged notch 202, the damaged notch 202 is arranged on one side close to the transparent visual window, and the seepage path can only pass through the damaged notch. The damaged pipeline model in different sizes, rigidity and the like can be replaced according to actual needs by the skilled person.
The electric push rod assembly can be arranged on a sealing cover at the front end of the pipeline through bolts, and the push rod jacking pipe of the electric push rod assembly covers the high-density rubber plug 207 to achieve the extrusion waterproof effect. In this embodiment, the direction of the damaged gap 202 can be realized by changing the installation angle of the simulated damaged pipe main body, and the size and shape of the damaged gap 202 can be realized by changing the extrusion force of the rubber plug 207 at the end of the electric push rod on the damaged gap 202. For example, because the damaged pipeline model is detachably connected with the chamber partition plate, the pipeline main body 201 is rotated by a certain angle along the axial direction of the pipeline and then is installed on the chamber partition plate 4, the direction of the damaged notch 202 can be rotated along with the rotation of the pipeline main body 201, and the purpose of adjusting the direction of the damaged notch 202 at the front end of the damaged pipeline model 2 is achieved; the extrusion force of the rubber plug 207 at the end of the electric push rod on the damaged notch 202 adjusts the size of the damaged notch 202 at the front end of the damaged pipeline model 2, under the condition of complete extrusion, the damaged notch 202 is completely blocked, and under the condition of gradually reducing the extrusion force, the rubber plug 207 and the damaged notch 202 are gradually separated, so that the size and the shape of the damaged notch 202 are adjusted, different working conditions can be simulated, and the repairable modification of a test form is ensured on the basis of not changing too many devices.
As shown in fig. 5, the test soil bin located in the middle area and the seepage bins on both sides thereof are separated by a pair of water permeable plates; the front end of the damaged pipeline model is positioned in a test soil bin, and a tested soil sample is filled in the test soil bin during test, and the filling height can be determined according to the test. In this embodiment, a pair of porous disk symmetry sets up, and its material is the porous disk of alloy steel, can avoid when hydrologic cycle to produce unnecessary the erodeing to experimental soil silo. Meanwhile, the highest water level during the test is limited by arranging a water level limiting hole for communicating the infiltration bin with the water circulation supply bin. The soil pressure sensor 303 and the pore pressure sensor 302 are arranged in a soil body in a linear mode, wherein the soil pressure sensor 303 is used for monitoring the soil pressure of a test soil bin in the test process, and the pore pressure sensor 302 is used for monitoring the evolution of the pore water pressure in the test soil bin in real time.
In a specific implementation of the present invention, a laser displacement sensing device 304 for measuring soil surface displacement in real time is further disposed above the test soil bin 8, as shown in fig. 6, the laser displacement sensing device 304 includes a laser displacement sensor connecting rod 3041 and a laser displacement sensor 3042, and the laser displacement sensor 3042 is mounted on the laser displacement sensor connecting rod 3041 in a linear manner. As shown in fig. 2, the laser displacement sensor connecting rod 3041 is installed on the upper portions of the right and left side plates of the case through screw holes.
In one embodiment of the present invention, as shown in FIG. 7, the ball valve device 205 is rotated to control the water supply and drain conditions of the damaged pipe, thereby controlling the water level in the pipe. The arrows in the figure indicate the water flow direction, and fig. 7 (a) shows the water supply by the submersible pump into the pipe, and fig. 7 (b) shows the free drainage by the broken pipe.
In one embodiment of the present invention, the water-sand separation device in the soil material filtering bin 10 adopts a multi-stage filtering manner to ensure that the water-soil mixture flowing back from the damaged pipe is fully collected, soil particles are used for analysis after the test, and the filtered water meets the working requirements of the submersible pump on the water quality of the water delivery; in the present embodiment, as shown in fig. 8, the water-sand separation device is implemented by using double-layer filter plates 7 with different leak hole radii, a pair of filter plates shown in fig. 8 are directly inserted into the reserved slots of the baffles on both sides, and strain monitoring members 301 are disposed on each layer of filter plates for monitoring the strain of the filter plates in real time. The water-soil mixture sequentially passes through the two filter plates with different leak hole radiuses, the particle size of the water-soil mixture is larger than the leak hole diameter and is blocked on the filter plates, soil particles with different particle sizes are respectively blocked on the two filter plates, and the filter plates can generate strain under the effect of supergravity. The strain monitoring assembly is pre-installed on the filter plate and used for monitoring the strain of the filter plate in real time, the strain can be calculated through a mechanical method to obtain the stress magnitude, and the real-time stress change can accurately describe the escape behavior of soil particles.
As shown in fig. 9, the strain monitoring assembly 301, the pore pressure sensor 302, the soil pressure sensor 303, the laser displacement sensing device 304 and the high-speed camera assembly 305 form a monitoring sensing system; the laser displacement sensor arranged on the laser displacement sensor connecting rod realizes real-time monitoring of the deformation of the surface of the foundation soil; the pore pressure sensor 302 and the soil pressure sensor 303 are used for monitoring the real-time water level and the soil pressure of the test soil bin and controlling the circulating water flow of the submersible pump according to water level information; the strain monitoring assembly 301 arranged on the water-sand separation device is used for measuring the strain condition of the water-sand separation device; the high speed camera assembly 305 mounted at the front panel of the cabinet at the viewing window 1011 is used to photograph the test procedure in real time.
In one specific implementation of the invention, the size of the damaged gap and the internal and external water levels of the damaged pipeline model are controlled by the servo control system after the data measured by the monitoring and sensing system is acquired by the data acquisition center. The servo control system adopted by the embodiment comprises a central processing device, a servo actuator control unit, a remote controller and a servo controller, wherein the central processing device acquires data of a data acquisition center, processes the data through the central processing device and feeds back an action command, the command can be transmitted to the local servo controller through the remote controller by the servo actuator control unit, and three servo actuators are arranged in the local device and are respectively used for realizing adjustment of circulating water quantity and flow direction of a water circulation supply bin, switching of water inlet and drainage functions of a water inlet and outlet control device and adjustment of the size of a damaged gap of a damaged pipeline model. For example, the power of the submersible pump is controlled by the servo actuator 1, so that the submersible pump completes water circulation at a certain speed to control the water level of the seepage bin, and the effect of controlling the water level outside the pipe in real time is achieved. The ball valve is controlled to rotate through the servo actuator 2, the drainage condition of the damaged pipe is changed, and meanwhile, the submersible pump is controlled to supply water to the inside of the simulated damaged pipe through the ball valve device, so that the test simulation of the water level full pipe flow in the pipe is realized. The extrusion force of the rubber plug at the end part of the electric push rod to the damaged notch is controlled by the servo actuator 3 so as to change the size of the opened damaged notch.
In one specific implementation of the invention, the submersible pump should meet the requirement that the self working efficiency reaches the required water circulation speed under the Ng gravity acceleration. The visual window of the front plate of the box body is made of organic glass with the light transmittance of more than or equal to 85 percent, can resist the lateral pressure of a soil body under the supergravity and meets the requirement of definition. The high-speed camera assembly should meet the requirements for stable and clear shooting under supergravity. The laser displacement sensor can ensure the monitoring precision under the supergravity state, and the error of the monitoring system is increased because the connecting rod does not deform excessively. In addition, waterproof measures should be applied between the model box body and the internal structure, waterproof measures should be applied to all bolt connection positions and plate joints, and specifically, the selected waterproof measures should meet the requirements that the model box deforms and has strength suitable for the Ng gravity acceleration and partitions each chamber.
In one embodiment of the present invention, the process of simulating the reciprocating leakage induced ground collapse of the damaged buried pipeline by using the centrifugal model test apparatus comprises:
a preparation stage: filling a model soil body in a test soil bin 8 of the device, and injecting circulating water in a water circulation supply bin 11;
and (3) a simulation test stage: comprises an outside water internal seepage simulation and an inside water external seepage simulation which are executed alternately;
in the process of performing external water internal seepage simulation, the water outlet control device of the damaged pipeline model 2 is switched to a water discharge level, the water circulation supply bin 11 is controlled to supply water to the seepage bin 9, and the external water level is stably controlled by adjusting the height of a water level limiting hole 401 on a compartment partition plate; water in the seepage bin 9 is soaked into soil of the test soil bin 8, a water-soil mixture flows into the damaged pipeline model 2 from a damaged notch 202 at the front end of the damaged pipeline model 2 and then is discharged from the rear end of the damaged pipeline model 2, and water filtered and purified by a water-sand separation device in the soil filtering bin 10 enters the water circulation supply bin 11 to realize water circulation; in the simulation process, the soil pressure, the water pressure and the soil surface displacement of the test soil bin 8 and the strain condition of a water-sand separation device of the soil material filtering bin 10 are monitored in real time, and the real-time soil particle loss is obtained according to the strain condition;
in the process of carrying out in-pipe water extravasation simulation, switching a water outlet control device of a damaged pipeline model 2 into a water inlet level, controlling a water circulation supply bin 11 to supply water to the damaged pipeline model 2, enabling water in the damaged pipeline model 2 to flow into soil of a test soil bin 8 from a damaged notch 202 at the front end and permeate into seepage bins 9 at two sides of the test soil bin 8, stably controlling the water level outside the pipe by adjusting the height of a water level limiting hole 401 on a bin partition plate, and enabling the water in the seepage bins 9 to flow back to the water circulation supply bin 11 when the water level outside the pipe reaches the height of the water level limiting hole 401, so as to realize water circulation; in the simulation process, the soil pressure, water pressure and soil surface displacement of the test soil bin 8 are monitored in real time.
In one embodiment of the present invention, in the preparation stage, the damaged pipeline model 2 is connected to the partition plate 4 at a different angle, so as to adjust the direction of the damaged notch 202 at the front end of the damaged pipeline model 2; at the simulation test stage, rubber buffer 207 through electric putter tip is to the extrusion force of damaged breach 202, adjusts the damaged breach 202 size of damaged pipeline model 2 front end, specifically is:
when the normal service working condition is simulated, the electric push rod is controlled to drive the rubber plug 207 at the end part to extend out, so that the rubber plug 207 is in close contact with the damaged notch 202, and the damaged notch 202 is completely blocked;
when the damage working condition of the damaged opening is simulated, the electric push rod is controlled to drive the rubber plug 207 at the end part to retract, and the disengagement degree of the rubber plug 207 and the damaged opening 202 is controlled through the retraction amount, so that the purpose of adjusting the size of the damaged opening 202 is achieved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A centrifugal test device for simulating the ground subsidence induced by the reciprocating leakage of a buried pipeline is characterized by comprising a model box body (1), a damaged pipeline model (2), a servo control system and a monitoring sensing system, wherein the model box body is divided into a front part and a rear part by a chamber partition plate (4), and the chamber partition plate (4) is provided with a mounting hole for fixing the damaged pipeline model;
a test soil bin (8) and seepage bins (9) on two sides of the test soil bin are arranged at the front part in the model box body, and a damage notch (202) with adjustable size is arranged at the front end of a damaged pipeline model in the test soil bin; the rear part in the model box body is provided with a soil material filtering bin (10) and water circulation supply bins (11) at two sides of the soil material filtering bin, the rear end of a damaged pipeline model in the soil material filtering bin is provided with a water inlet and outlet control device, and a water sand separation device is arranged below the water inlet and outlet control device; a water level limiting hole (401) which is communicated with the seepage bin (9) and the water circulation supply bin (11) is formed in the bin partition plate (4);
the servo control system is used for controlling the size of a damaged gap of the damaged pipeline model and the internal and external water levels; the monitoring and sensing system is used for measuring the soil pressure, the water pressure and the soil surface displacement of the test soil bin (8) in real time and the strain condition of the water-sand separation device of the soil filtering bin (10).
2. The centrifugal test device for simulating reciprocating leakage-induced subsidence of a buried pipeline according to claim 1, wherein the damaged pipeline model (2) comprises a pipeline main body (201), a pipeline front end sealing cover (203), a pipeline rear end sealing cover (204) and an electric push rod assembly (206); the pipeline main body (11) is fixed in a mounting hole of the bin partition plate (4) through a flange plate (207), the pipeline front end sealing cover (203) and the pipeline rear end sealing cover (204) are respectively used for sealing the front end and the rear end of the pipeline main body (11), and the damage notch (202) is positioned on the pipeline main body (11) and close to the pipeline front end sealing cover (203); the electric push rod assembly (206) is arranged on the inner side of a front end sealing cover (203) of the pipeline, and the size of the broken notch (202) is adjusted through a rubber plug (207) at the end part of the electric push rod.
3. The centrifugal test device for simulating the reciprocating leakage induced subsidence of the buried pipeline according to claim 2, wherein the water inlet and outlet control device adopts a ball valve device, and the ball valve device is arranged on a sealing cover (204) at the rear end of the pipeline and used for switching the water inlet and the water outlet of the damaged pipeline model (2).
4. The centrifugal test device for simulating the reciprocating leakage of the buried pipeline to induce the ground subsidence according to the claim 1, characterized in that the soil filtering bin (10) and the water circulation supply bins (11) at the two sides of the soil filtering bin are separated by a pair of baffle plates (6), and the bottom of the baffle plates is provided with a hole for communicating the soil filtering bin (10) and the water circulation supply bins (11); the water-sand separation device is fixed in the soil material filtering bin (10) through a baffle and is positioned below the damaged pipeline model (2).
5. A centrifugal test device for simulating reciprocating leakage induced subsidence of a buried pipeline according to claim 4, wherein the water-sand separation device is one or more layers of filter plates (7).
6. The centrifugal test device for simulating reciprocating leakage induced subsidence of a buried pipeline according to claim 4, characterized in that a submersible pump (12) is installed in the water circulation supply bin (11), and the submersible pump (12) is respectively connected with the water inlet and outlet control device of the damaged pipeline model and the seepage bin (9) through controllable water outlet pipelines.
7. The centrifugal test device for simulating reciprocating leakage-induced subsidence of a buried pipeline according to claim 1, wherein the monitoring sensing system comprises a strain monitoring assembly (301), a pore pressure sensor (302), an earth pressure sensor (303), a laser displacement sensing device (304) and a high-speed camera assembly (305);
the pore pressure sensor (302) and the soil pressure sensor (303) are buried in the soil body of the test soil bin (8) in a line mode in a layered mode; the laser displacement sensing device (304) is arranged above the test soil bin (8) in a linear mode and used for measuring the soil surface displacement in the test soil bin (8); the strain monitoring assembly (301) is arranged on the water-sand separation device and used for measuring the strain condition of the water-sand separation device; the high-speed camera assembly (305) is arranged on a visible window (1011) of a front plate of the box body.
8. The centrifugal test device for simulating reciprocating leakage induced subsidence of a buried pipeline according to claim 1, wherein the servo control system comprises a servo controller and a plurality of servo actuators, and each servo actuator is used for realizing the adjustment of the circulating water quantity and the flow direction of the water circulation supply bin (11), the switching of the water inlet and the water outlet functions of the water inlet and outlet control device and the size adjustment of the damaged gap (202) of the damaged pipeline model.
9. A test method of a centrifugal test device for simulating reciprocating leakage-induced subsidence of a buried pipeline according to any one of claims 1 to 8, comprising:
a preparation stage: filling a model soil body in a test soil bin (8) of the device, and injecting circulating water into a water circulation supply bin (11);
and (3) a simulation test stage: comprises an outside water internal seepage simulation and an inside water external seepage simulation which are executed alternately;
in the process of performing external water internal seepage simulation, the water outlet control device of the damaged pipeline model (2) is switched to a water drainage level, a water circulation supply bin (11) is controlled to supply water to the seepage bin (9), and the external water level is stably controlled by adjusting the height of a water level limiting hole (401) on a partition plate of a bin; water in the seepage bin (9) is soaked into soil of the test soil bin (8), a water-soil mixture flows into the damaged pipeline model (2) from a damaged notch (202) at the front end of the damaged pipeline model (2), then is discharged from the rear end of the damaged pipeline model (2), and water filtered and purified by a water-sand separation device in the soil filtering bin (10) enters a water circulation supply bin (11) to realize water circulation; in the simulation process, the soil pressure, the water pressure and the soil surface displacement of the test soil bin (8) and the strain condition of a water-sand separation device of the soil material filtering bin (10) are monitored in real time, and the real-time loss of soil particles is obtained according to the strain condition;
in the process of carrying out in-pipe water extravasation simulation, a water outlet control device of a damaged pipeline model (2) is switched to a water inlet level, a water circulation supply bin (11) is controlled to supply water to the damaged pipeline model (2), water in the damaged pipeline model (2) flows into soil of a test soil bin (8) from a damaged notch (202) at the front end and permeates into seepage bins (9) at two sides of the test soil bin (8), the water level outside the pipe is stably controlled by adjusting the height of a water level limiting hole (401) on a bin partition plate, and when the water level outside the pipe reaches the height of the water level limiting hole (401), the water in the seepage bins (9) flows back to the water circulation supply bin (11) to realize water circulation; in the simulation process, the soil pressure, water pressure and soil surface displacement of the test soil bin (8) are monitored in real time.
10. The test method of the centrifugal test device for simulating the reciprocating leakage induced subsidence of the buried pipeline according to the claim 9 is characterized in that in the preparation stage, the purpose of adjusting the direction of the damaged notch (202) at the front end of the damaged pipeline model (2) is realized by changing the connection angle of the damaged pipeline model (2) and the chamber partition plate (4); at the analogue test stage, rubber buffer (207) through electric putter tip is to the extrusion force of damaged breach (202), adjusts damaged breach (202) size of damaged pipeline model (2) front end, specifically is:
when the normal service working condition is simulated, the electric push rod is controlled to drive the rubber plug (207) at the end part to extend out, so that the rubber plug (207) is in close contact with the damaged notch (202), and the damaged notch (202) is completely blocked;
when the damage working condition of a damaged opening is simulated, the electric push rod is controlled to drive the rubber plug (207) at the end part to retract, and the disengagement degree of the rubber plug (207) and the damaged notch (202) is controlled through the retraction amount, so that the purpose of adjusting the size of the damaged notch (202) is achieved.
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| CN202210670677.0A CN115165242B (en) | 2022-06-14 | 2022-06-14 | Centrifugal test device and method for simulating buried pipeline reciprocating leakage induced subsidence |
| PCT/CN2023/086065 WO2023241174A1 (en) | 2022-06-14 | 2023-04-04 | Centrifugal test device for simulating process of reciprocating leakage of buried pipe inducing land subsidence, and method |
| US18/388,535 US11940366B1 (en) | 2022-06-14 | 2023-11-10 | Centrifugal testing device and method for simulating ground subsidence induced by buried pipeline leakage and infiltration |
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| CN202210670677.0A CN115165242B (en) | 2022-06-14 | 2022-06-14 | Centrifugal test device and method for simulating buried pipeline reciprocating leakage induced subsidence |
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| WO2023241174A1 (en) * | 2022-06-14 | 2023-12-21 | 浙江大学 | Centrifugal test device for simulating process of reciprocating leakage of buried pipe inducing land subsidence, and method |
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| CN115165242B (en) | 2023-07-25 |
| WO2023241174A1 (en) | 2023-12-21 |
| US20240077403A1 (en) | 2024-03-07 |
| US11940366B1 (en) | 2024-03-26 |
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